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Switched room thermostat on and boiler called for heat.....Turned tank stat off then turned room stat off boiler cut out.......Tried several times and boiler always cut off...All seems to be OK now perhaps the valve was sticking after such a long time for not calling for heat ???.......Thanks...

Thanks for all the great info will check it out tomorrow and let you know.........I did replace the PCB within this valve some 8 years ago or so

Y Plan ??? Do you mean the motorised valve that calls between heating and water ?? with the PCB fitted in the silver box or otherwise .....i do have a 3 position switch on the controller in the airing cupboard IE Timed/off & heating and this is set to heating and on the opposite side a 3...

I woke up to what i thought was a hot flush but only to find out that my heating had decided to come alive with all the rads in the house red hot i checked the room stat only to find that it is on zero?? i turned it to 20c and then back off and there is a definate click the heating did appear to...